/*
Class: PluginNSV
Version: 1.0.1
Date: 2019/03/20
Description:
   Fix showURL function parsing error on local characters.
 */

function getNetProtocol() {
    if (!!window.WebSocket && window.WebSocket.prototype.send) {
        return "WebSocket";
    } else return "Http";
}

function PluginNSV() {
    this.NetProtocol = getNetProtocol();
    if (this.NetProtocol=== "WebSocket")
        this.net = getWSNetObject();
    else this.net = getHttpNetObject();
}

PluginNSV.prototype.InitPlugin = function (result_callback) {
    if (this.net == null) {
        result_callback(0);
    }
    this.func_callback = [];
    this.invoke_state = [];
    this.invoke_id = 10000;
    this.init_result = result_callback;

    this.net.setStateCallback(this, this.net_state_callback);
    this.net.setDataCallback(this, this.net_data_callback);
    if (this.NetProtocol === "WebSocket")
        this.net.connect("localhost:10430");
    else
        this.net.connect("localhost:10431");
};

PluginNSV.prototype.DestroyPlugin = function () {
    this.net.setStateCallback(null, null);
    this.net.setDataCallback(null, null);
    this.net.disconnect();

    this.func_callback = [];
};

PluginNSV.prototype.net_state_callback = function (object, state) {
    //current "this" object is the "net" scope.
    var plugin = object;
    if (!!plugin.onStateChange) {
        plugin.onStateChange(state);
    }
    if(!!plugin.init_result){
        plugin.init_result(state);
        plugin.init_result = null;
    }
};

PluginNSV.prototype.net_data_callback = function (object, data) {
    var plugin = object;
    var context = data.split(',');

    var msg_type = parseInt(context[0]);
    switch (msg_type) {
        case NSV_Msg_Type.Func_Invoke: {

        }
            break;
        case NSV_Msg_Type.Func_Result: {
            var invoke_id = context[1];
            var func_id = context[2];
            var func_name = context[3];
            var state = (context[4] === '1');

            var args = [];
            var index = 0;
            for (var ele in context) {
                if (index > 4) {
                    args.push(context[index]);
                }
                index++;
            }

            if (plugin.func_callback.hasOwnProperty(func_id)) {
                if ((typeof plugin.func_callback[func_id]) === "function") {
                    plugin.func_callback[func_id](state, args);
                }
                plugin.func_callback[func_id] = null;

                if (plugin.invoke_state.hasOwnProperty(invoke_id)) {
                    //clear invoke state
                    clearTimeout(plugin.invoke_state[invoke_id].timer);
                    plugin.invoke_state[invoke_id] = null;
                }
            }
        }
            break;
        case NSV_Msg_Type.Data_Event: {
            var id = parseInt(context[1]);
            switch (id) {
                case  NSV_Event_Id.Event_Id_Click: {

                }
                    break;
                case  NSV_Event_Id.Event_Id_Touch: {

                }
                    break;
                case  NSV_Event_Id.Event_Id_Key: {

                }
                    break;
                case NSV_Event_Id.Event_Id_User: {
                    var type = parseInt(context[2]);
                    switch (type) {
                        case NSV_User_Event.User_Event_Confirm: {
                            if (!!plugin.onConfirm && (typeof plugin.onConfirm) === "function") {
                                //invoke callback function
                                plugin.onConfirm();
                            }
                        }break;
                        case NSV_User_Event.User_Event_Clear: {
                            if (!!plugin.onClear && (typeof plugin.onClear) === "function") {
                                //invoke callback function
                                plugin.onClear();
                            }
                        }break;
                        case NSV_User_Event.User_Event_Cancel: {
                            if (!!plugin.onCancel && (typeof plugin.onCancel) === "function") {
                                //invoke callback function
                                plugin.onCancel();
                            }
                        }break;
                    }
                }
                    break;

            }
        }
            break;
        case NSV_Msg_Type.Sys_State: {
            var id = parseInt(context[1]);
            switch (id) {
                case NSV_Sys_Id.Sys_Id_State: {
                    /*state*/
                    if (plugin.onDevNotifyEvent != null && (typeof plugin.onDevNotifyEvent) === "function") {
                        var state = parseInt(context[2]);
                        plugin.onDevNotifyEvent(state);
                    }
                }
                    break;
            }
        }
            break;
    }
};

PluginNSV.prototype.callbackTimeOut = function (sender, invoke_flag) {
    if (!!sender) {
        if (sender.invoke_state.hasOwnProperty(invoke_flag)) {
            var ele = sender.invoke_state[invoke_flag];
            if (!!ele.func) {
                var args = [];
                args.push("invoke function timeout");
                ele.func(0, args);
            }
        }
    }
    // alert("invoke timer");
};

PluginNSV.prototype.invoke_interface = function (id, code, _callback) {
    this.func_callback[id] = _callback;

    if (this.invoke_id >= 0xffff) {
        this.invoke_id = 10000;
    }

    var invoke_id = ++this.invoke_id;
    var set = code.join(',');
    set = invoke_id.toString() + "," + set;

    this.net.write(set);
    //add invoke flag
    this.invoke_state[invoke_id.toString()] = {
        func: _callback,
        timer: setTimeout(this.callbackTimeOut, 2000, this, invoke_id.toString())
    };
};

/*
=============================================================================
plugin constants
*/
/*message type*/
var NSV_Msg_Type = {
    Func_Invoke: 1001,
    Func_Result: 1002,
    Data_Event: 1003,
    Sys_State: 1004
};

/*function id*/
var NSV_Func_Id = {
    SetPenSizeRange: 1,
    GetPenSizeRange: 2,
    SetPenColor: 3,
    GetPenColor: 4,
    SetBKColor: 5,
    GetBKColor: 6,
    SetBorderColor: 7,
    GetBorderColor: 8,
    IsConnected: 9,
    ClearSign: 10,
    SaveImageToFile: 11,
    SaveImageToFileEx: 12,
    SaveSignToFile: 13,
    SetPenMode: 14,
    RegBtnClickEvent: 15,
    UnregBtnClickEvent: 16,
    SaveImageToBase64: 17,
    SaveSignToBase64: 18,
    GetScreenRect: 19,
    EnableSystemTouch: 20,
    SetScreenRotation: 21,
    MouseControl:22
};

/*function id extend*/
var NSV_Func_Id_Ex = {
    BeginSign: 81,
    EndSign: 82,
    MoveSignWindow:83,
    ShowURL:84,
    CloseURL:85
};

/*property id*/
var NSV_Property_Id = {
    Set_BorderVisible: 101,
    Get_BorderVisible: 102,
    Set_ExtendDisplay: 103,
    Get_ExtendDisplay: 104,
    Set_DisplayMapMode: 105,
    Get_DisplayMapMode: 106,
    Set_SignMode: 107,
    Get_SignMode: 108
};

/*data event sub id*/
var NSV_Event_Id = {
    Event_Id_Click: 301,
    Event_Id_Touch: 302,
    Event_Id_Key: 303,
    Event_Id_User:304
};

var NSV_User_Event={
    User_Event_Confirm:1,
    User_Event_Clear:2,
    User_Event_Cancel:3
};

/*system state event sub id*/
var NSV_Sys_Id = {
    Sys_Id_State: 401
};

/*
=============================================================================
plugin interface
*/
PluginNSV.prototype.setPenSizeRange = function (min, max, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SetPenSizeRange.toString();
    code.push(func_id_string);
    code.push("SetPenSizeRange");

    code.push(min.toString());
    code.push(max.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[min,max])*/
PluginNSV.prototype.getPenSizeRange = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.GetPenSizeRange.toString();
    code.push(func_id_string);
    code.push("GetPenSizeRange");

    this.invoke_interface(func_id_string, code, result_callback);
};

PluginNSV.prototype.setPenColor = function (r, g, b, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SetPenColor.toString();
    code.push(func_id_string);
    code.push("SetPenColor");

    code.push(r.toString());
    code.push(g.toString());
    code.push(b.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[r,g,b])*/
PluginNSV.prototype.getPenColor = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.GetPenColor.toString();
    code.push(func_id_string);
    code.push("GetPenColor");

    this.invoke_interface(func_id_string,code, result_callback);
};

PluginNSV.prototype.setBKColor = function (r, g, b, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SetBKColor.toString();
    code.push(func_id_string);
    code.push("SetBKColor");

    code.push(r.toString());
    code.push(g.toString());
    code.push(b.toString());
    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[r,g,b])*/
PluginNSV.prototype.getBKColor = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.GetBKColor.toString();
    code.push(func_id_string);
    code.push("GetBKColor");

    this.invoke_interface(func_id_string, code, result_callback);
};

PluginNSV.prototype.setBorderColor = function (r, g, b, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SetBorderColor.toString();
    code.push(func_id_string);
    code.push("SetBorderColor");

    code.push(r.toString());
    code.push(g.toString());
    code.push(b.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[r,g,b])*/
PluginNSV.prototype.getBorderColor = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.GetBorderColor.toString();
    code.push(func_id_string);
    code.push("GetBorderColor");

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[state])*/
PluginNSV.prototype.isConnected = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.IsConnected.toString();
    code.push(func_id_string);
    code.push("IsConnected");

    this.invoke_interface(func_id_string, code, result_callback);
};

PluginNSV.prototype.clearSign = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.ClearSign.toString();
    code.push(func_id_string);
    code.push("ClearSign");

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.saveImageToFile = function (path, format, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SaveImageToFile.toString();
    code.push(func_id_string);
    code.push("SaveImageToFile");

    code.push(path);
    code.push(format.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.saveImageToFileEx = function (path, format, width, height, quality, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SaveImageToFileEx.toString();
    code.push(func_id_string);
    code.push("SaveImageToFileEx");

    code.push(path);
    code.push(format.toString());
    code.push(width.toString());
    code.push(height.toString());
    code.push(quality.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.saveSignToFile = function (path, width, height, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SaveSignToFile.toString();
    code.push(func_id_string);
    code.push("SaveSignToFile");

    code.push(path);
    code.push(width.toString());
    code.push(height.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.setPenMode = function (mode, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SetPenMode.toString();
    code.push(func_id_string);
    code.push("SetPenMode");

    code.push(mode.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.regBtnClickEvent = function (btn_index, x, y, width, height, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.RegBtnClickEvent.toString();
    code.push(func_id_string);
    code.push("RegBtnClickEvent");

    code.push(btn_index.toString());
    code.push(x.toString());
    code.push(y.toString());
    code.push(width.toString());
    code.push(height.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.unregBtnClickEvent = function (btn_index, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.UnregBtnClickEvent.toString();
    code.push(func_id_string);
    code.push("UnregBtnClickEvent");

    code.push(btn_index.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[base64string])*/
PluginNSV.prototype.saveImageToBase64 = function (format, width, height, quality, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SaveImageToBase64.toString();
    code.push(func_id_string);
    code.push("SaveImageToBase64");

    code.push(format.toString());
    code.push(width.toString());
    code.push(height.toString());
    code.push(quality.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[base64string])*/
PluginNSV.prototype.saveSignToBase64 = function (width, height, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SaveSignToBase64.toString();
    code.push(func_id_string);
    code.push("SaveSignToBase64");

    code.push(width.toString());
    code.push(height.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[left,top,right,bottom])*/
PluginNSV.prototype.getScreenRect = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.GetScreenRect.toString();
    code.push(func_id_string);
    code.push("GetScreenRect");

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.setScreenRotation = function (angle, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id.SetScreenRotation.toString();
    code.push(func_id_string);
    code.push("SetScreenRotation");

    code.push(angle.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.mouseControl = function(enabled,result_callback){
    var code = [];
    var func_id_string = NSV_Func_Id.MouseControl.toString();
    code.push(func_id_string);
    code.push("MouseControl");

    if(enabled && enabled!=='0' && enabled!==0){
        enabled = 1;
    }else{
        enabled = 0;
    }
    code.push(enabled.toString());
    this.invoke_interface(func_id_string, code, result_callback);
};
/*
=============================================================================
plugin interface extend
*/
/*callback func(state,args[])*/
PluginNSV.prototype.beginSign = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id_Ex.BeginSign.toString();
    code.push(func_id_string);
    code.push("BeginSign");

    this.invoke_interface(func_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.endSign = function (result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id_Ex.EndSign.toString();
    code.push(func_id_string);
    code.push("EndSign");

    this.invoke_interface(func_id_string, code, result_callback);
};

PluginNSV.prototype.moveSignWindow = function (x, y, width, height, result_callback) {
    var code = [];
    var func_id_string = NSV_Func_Id_Ex.MoveSignWindow.toString();
    code.push(func_id_string);
    code.push("MoveSignWindow");

    code.push(x.toString());
    code.push(y.toString());
    code.push(width.toString());
    code.push(height.toString());

    this.invoke_interface(func_id_string, code, result_callback);
};

PluginNSV.prototype.showURL = function(url,result_callback){
    var code = [];
    var func_id_string = NSV_Func_Id_Ex.ShowURL.toString();
    code.push(func_id_string);
    code.push("ShowURL");

    url = url.replace(/\\/ig,"/");
    if(url.search("\%")==-1)
        url = encodeURI(url);

    code.push(url);

    this.invoke_interface(func_id_string, code, result_callback);
};

PluginNSV.prototype.closeURL = function(result_callback){
    var code = [];
    var func_id_string = NSV_Func_Id_Ex.CloseURL.toString();
    code.push(func_id_string);
    code.push("CloseURL");

    this.invoke_interface(func_id_string, code, result_callback);
};

/*
=============================================================================
plugin property
*/
/*callback func(state,args[])*/
PluginNSV.prototype.setBorderVisible = function (visible, result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Set_BorderVisible.toString();
    code.push(property_id_string);
    code.push("Set_BorderVisible");

    code.push((visible === false || visible === "undefined" || visible == null) ? "0" : "1");

    this.invoke_interface(property_id_string, code, result_callback);
};

/*callback func(state,args[visible])*/
PluginNSV.prototype.getBorderVisible = function (result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Get_BorderVisible.toString();
    code.push(property_id_string);
    code.push("Get_BorderVisible");

    this.invoke_interface(property_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.setExtendDisplay = function (extend, result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Set_ExtendDisplay.toString();
    code.push(property_id_string);
    code.push("Set_ExtendDisplay");

    code.push((extend === false || extend === "undefined" || extend === null) ? "0" : "1");

    this.invoke_interface(property_id_string, code, result_callback);
};

/*callback func(state,args[extend])*/
PluginNSV.prototype.getExtendDisplay = function (result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Get_ExtendDisplay.toString();
    code.push(property_id_string);
    code.push("Get_ExtendDisplay");

    this.invoke_interface(property_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.setDisplayMapMode = function (mode, result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Set_DisplayMapMode.toString();
    code.push(property_id_string);
    code.push("Set_DisplayMapMode");

    code.push(mode.toString());

    this.invoke_interface(property_id_string, code, result_callback);
};

/*callback func(state,args[mode])*/
PluginNSV.prototype.getDisplayMapMode = function (result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Get_DisplayMapMode.toString();
    code.push(property_id_string);
    code.push("Get_DisplayMapMode");

    this.invoke_interface(property_id_string, code, result_callback);
};

/*callback func(state,args[])*/
PluginNSV.prototype.setSignMode = function (mode, result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Set_SignMode.toString();
    code.push(property_id_string);
    code.push("Set_SignMode");

    code.push(mode.toString());

    this.invoke_interface(property_id_string, code, result_callback);
};

/*callback func(state,args[mode])*/
PluginNSV.prototype.getSignMode = function (result_callback) {
    var code = [];
    var property_id_string = NSV_Property_Id.Get_SignMode.toString();
    code.push(property_id_string);
    code.push("Get_SignMode");

    this.invoke_interface(property_id_string, code, result_callback);
};

/*
=============================================================================
plugin service events
*/
/*callback func(state)*/
PluginNSV.prototype.onStateChange = null;
/*
=============================================================================
plugin device events
*/
/*callback func(state)*/
PluginNSV.prototype.onDevNotifyEvent = null;

/*callback func(index)*/
PluginNSV.prototype.onBtnClickEvent = null;

/*callback func(index)*/
PluginNSV.prototype.onTouchEvent = null;

/*callback func(physical_key,virtual_key)*/
PluginNSV.prototype.onKeyEvent = null;

/*
=============================================================================
plugin extended events
*/
/*callback func()*/
PluginNSV.prototype.onConfirm = null;

/*callback func()*/
PluginNSV.prototype.onClear = null;

/*callback func()*/
PluginNSV.prototype.onCancel = null;


/*
=============================================================================
WSNetObject class
*/
function getWSNetObject() {
    return {
        ws: null,
        url: null,
        time_out: 3000,
        time_out_func: null,
        state_callback: null,
        state_object: null,
        data_callback: null,
        data_object: null,
        timer_reconn: null,
        connect: function (url) {
            if (!(!!window.WebSocket && window.WebSocket.prototype.send)) {
                return null;
            }
            this.url = url;
            url = "ws://" + url;
            this.ws = new WebSocket(url);
            this.ws.owner = this;
            this.ws.onopen = function () {
                var owner = this.owner;
                if (!!owner.state_callback) {
                    owner.state_callback(owner.state_object, 1);
                }
            };
            this.ws.onclose = function (evt) {
                var owner = this.owner;
                if (!!owner.state_callback) {
                    owner.state_callback(owner.state_object, 0);
                }
            };
            this.ws.onmessage = function (evt) {
                var owner = this.owner;
                if (!!owner.data_callback) {
                    owner.data_callback(owner.data_object, evt.data);
                }
            };
            this.ws.onerror = function (evt) {
                var owner = this.owner;
                owner.disconnect();
            };
            return true;
        },
        disconnect: function () {
            if (this.ws != null) {
                this.ws.close();
                this.ws = null;
            }
        },
        reconnect: function () {
            this.disconnect();
            this.connect(this.url);
        },
        beginReconnect: function () {
            if (this.timer_reconn == null) {
                this.timer_reconn = setInterval(callback_reconn(this), this.time_out);
            }
        },
        endReconnect: function () {
            if (this.timer_reconn != null) {
                clearInterval(this.timer_reconn);
                this.timer_reconn = null;
            }
        },
        getConnectionState: function () {
            if (!!this.ws) {
                return (this.ws.readyState === WebSocket.OPEN);
            }
            return false;
        },
        setStateCallback: function (object, func) {
            this.state_object = object;
            this.state_callback = func;
        },
        setDataCallback: function (object, func) {
            this.data_object = object;
            this.data_callback = func;
        },
        write: function (data) {
            if (this.getConnectionState()) {
                try {
                    this.ws.send(data);
                }
                catch (e) {
                    return false;
                }
                return true;
            }
            return false;
        }
    };
}

function _callback_reconn(obj) {
   // console.log("reconnect...");
    if (obj != null) {
        obj.reconnect();
    }
}

var callback_reconn = function (obj) {
    return function () {
        _callback_reconn(obj);
    }
};

/*
=============================================================================
HttpNetObject class
*/
function getHttpNetObject() {
    return {
        http: null,
        url: null,
        time_out: 3000,
        time_out_func: null,
        state_callback: null,
        state_object: null,
        data_callback: null,
        data_object: null,
        timer_reconn: null,
        connect: function (url) {
            if (url.substring(0, 7) !== "http://") {
                url = "http://" + url;
                this.url = url;
                this.http = new NSV_Ajax(url);
                this.http.owner = this;
                this.http.onopen = function () {
                    var owner = this.owner;
                    if (!!owner.state_callback) {
                        owner.state_callback(owner.state_object, 1);
                    }
                };
                this.http.onclose = function (evt) {
                    var owner = this.owner;
                    if (!!owner.state_callback) {
                        owner.state_callback(owner.state_object, 0);
                    }
                };
                this.http.onmessage = function (data) {
                    var owner = this.owner;
                    if (!!owner.data_callback) {
                        owner.data_callback(owner.data_object, data);
                    }
                };
                this.http.onerror = function (evt) {
                    console.log(evt);
                };
            }
        },
        disconnect: function () {
            if (this.http != null) {
                this.http.close();
                this.http = null;
            }
        },
        getConnectionState: function () {
            if (!!this.http) {
                return (this.http.state === NSV_Ajax_State.Open);
            }
            return false;
        },
        setStateCallback: function (object, func) {
            this.state_object = object;
            this.state_callback = func;
        },
        setDataCallback: function (object, func) {
            this.data_object = object;
            this.data_callback = func;
        },
        write: function (data) {
            if (this.getConnectionState()) {
                try {
                    this.http.send(data);
                }
                catch (e) {
                    return false;
                }
                return true;
            }
            return false;
        }
    };
}

/*
=============================================================================
Class: NSV_Ajax
Version: 1.0.0
Date: 2018/12/17
 */
function getXMLHttpRequest() {
    if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        return ActiveXObject("Microsoft.XMLHttp");
    }
}

function NSV_Ajax(url) {
    if(url.substring(0,7)!=="http://"){
        url="http://"+url;
    }
    this.state = NSV_Ajax_State.Closed;
    this.http_url = url;
    this.http_url_event = url.substring(0,url.length-5) + (parseInt(url.substring(url.length-5,url.length))+1);

    this.handShake();
}

/*
==================================================
constant
*/
var NSV_Ajax_State = {
    Closed: 0,
    Open: 1
};

var NSV_Ajax_Protocol = {
    Connect: "connect",
    Data: "data",
    Close: "close"
};

/*
==================================================
property
*/
NSV_Ajax.prototype.state = NSV_Ajax_State.Closed;
NSV_Ajax.prototype.http_url = "";
NSV_Ajax.prototype.http_url_event = "";
NSV_Ajax.prototype.xhrRecv = null;

NSV_Ajax.prototype.PumpMessage = null;

//open event
NSV_Ajax.prototype.onopen = null;
//close event
NSV_Ajax.prototype.onclose = null;
//message event
NSV_Ajax.prototype.onmessage = null;
//error event
NSV_Ajax.prototype.onerror = null;

/*
==================================================
method
*/
NSV_Ajax.prototype.handShake = function () {
    if (!!this.http_url) {
        var xhr = getXMLHttpRequest();
        xhr.open('POST', this.http_url, true);
        xhr.responseType = "text";
        xhr.timeout = 2000;
        xhr.setRequestHeader('msg-type', '' + NSV_Ajax_Protocol.Connect);
        xhr.owner = this;
        xhr.onreadystatechange = function () {
            if (this.readyState === 4) {
                try {
                    if (this.status === 200) {
                        if (this.responseText === "OK") {
                            //server is running
                            this.owner.state = NSV_Ajax_State.Open;
                            //activate open event
                            if (!!this.owner.onopen && (typeof this.owner.onopen) === "function") {
                                this.owner.onopen();
                            }
                            this.owner.postRecvRequest(this.owner);
                        }
                    }
                }
                catch (e) {
                    if (!!this.owner.onerror && (typeof this.owner.onerror) === "function") {
                        //this.owner.onclose();
                        this.owner.onerror(e);
                    }
                }
            }
        };
        xhr.ontimeout =function(e){
            if (!!this.owner.onerror && (typeof this.owner.onerror) === "function") {
                this.owner.onclose();
                // this.owner.onerror(e);
            }
        };
        xhr.send("HandShake");
    }
};

NSV_Ajax.prototype.postRecvRequest = function (owner) {
    if (!!this.http_url) {
        /*create a new http connection*/
        this.xhrRecv = getXMLHttpRequest();
        this.xhrRecv.open('POST', this.http_url_event, true);
        this.xhrRecv.setRequestHeader('msg-type', '' + NSV_Ajax_Protocol.Data);
        this.xhrRecv.responseType = "text";
        this.xhrRecv.owner = owner;
        this.xhrRecv.onreadystatechange = function () {
            if (this.readyState === 4) {
                if (this.status === 200) {
                    if (!!this.owner.onmessage && (typeof this.owner.onmessage) === "function") {
                        this.owner.onmessage(this.responseText);
                    }
                    // this.owner.recvHandler(this.responseText);

                    this.owner.postRecvRequest(owner);
                }
            }
        };
        this.xhrRecv.send("Recv");
    }
};


NSV_Ajax.prototype.recvHandler = function (data) {
    console.log(data);
};

NSV_Ajax.prototype.postSendRequest = function (data, _callback, timeout) {
    if (!!this.http_url) {
        var xhr = getXMLHttpRequest();
        xhr.open('POST', this.http_url, true);
        xhr.responseType = "text";
        xhr.setRequestHeader('msg-type', '' + NSV_Ajax_Protocol.Data);
        //bind callback
        xhr.owner = this;
        xhr.send_callback = _callback;
        if (!!timeout && timeout > 0) {
            xhr.timeout = timeout;
        }
        xhr.onreadystatechange = function () {
            if (this.readyState === 4) {
                if (this.status === 200) {
                    if (!!this.send_callback && (typeof this.send_callback) === "function") {
                        this.send_callback(this.responseText);
                        this.owner.onmessage(this.responseText);
                        // console.log("send result"+this.responseText);
                    }
                }
            }
        };
        xhr.send(data);
    }
};

NSV_Ajax.prototype.close = function () {
    this.state = NSV_Ajax_State.Closed;
};

NSV_Ajax.prototype.send = function (data) {
    this.postSendRequest(data,this.recvHandler,2000);
};